title: Nitrogen control in AO process with recirculation of solubilized excess sludge.
mesh_terms: D000641:Ammonia / Q000032:analysis; D008962:Models, Theoretical; D009584:Nitrogen / Q000302:isolation & purification*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010100:Oxygen; D010126:Ozone / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D010083:Oxidants, Photochemical; D012722:Sewage; D010126:Ozone; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen